Coupled toroidal resonator based miniaturized differential band-pass filter

A ring resonator and band-pass filter technology, applied in resonators, waveguide devices, electrical components, etc., can solve the problems of unsatisfactory common mode rejection and large size of differential filters, and achieve steep edge selection characteristics, The effect of size reduction and high common mode rejection characteristics
CN104377409AInactive Publication Date: 2015-02-25THE 28TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
THE 28TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
Publication Date
2015-02-25
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention provides a coupled toroidal resonator based miniaturized differential band-pass filter. The coupled toroidal resonator based miniaturized differential band-pass filter comprises two centrally-symmetrical mutually-coupled toroidal resonators, wherein each toroidal resonator comprises four micro-strip line combinations. The first toroidal resonator comprises a rectangular ring composed of a first micro-strip line, a second micro-strip line, a third micro-strip line and a fourth micro-strip line, a first output port and a second output port, wherein the first micro-strip line is located above the rectangular ring and is vertically symmetrical to the third micro-strip line, the second micro-strip line and the fourth micro-strip line are respectively located on the left side and right side of the first micro-strip line and are both connected with the first micro-strip line and the third micro-strip line, the first output port is connected with the first micro-strip line, and the second output port is connected with the third micro-strip line. The coupled toroidal resonator based miniaturized differential band-pass filter has lower difference mode pass band insertion loss, higher return loss, a steep edge selection characteristic and a higher common-mode rejection characteristic.
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Description

Technical field

[0001] The present invention relates to the technical field of microwave and millimeter waves, in particular to a miniaturized differential band pass filter based on a coupled ring resonator. Background technique

[0002] The electromagnetic interference problem in wireless communication electronic equipment and medical equipment is gradually becoming serious. This problem is very serious and should not be ignored by medical organizations. There is evidence that errors in detection data or images caused by electromagnetic interference will cause doctors to make diagnoses that threaten the health and even life of patients. Therefore, the balanced circuit that can suppress noise, higher dynamic range and lower electromagnetic interference has attracted the attention of many organizations. For the differential mode excitation of the differential filter, it should have excellent out-of-band suppression and high selection characteristics. Lower insertion loss and bet...

Claims

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